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authorMattias Andrée <maandree@operamail.com>2014-04-01 12:13:04 +0200
committerMattias Andrée <maandree@operamail.com>2014-04-01 12:13:04 +0200
commit1ba7817874f2505c36166e091413880a7d6066ed (patch)
tree2c6b73b4388178724a897a03f25b01d5c9ad1cbd /src/blueshift_iccprofile.c
parentdocument (diff)
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document
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src/blueshift_iccprofile.c')
-rw-r--r--src/blueshift_iccprofile.c85
1 files changed, 78 insertions, 7 deletions
diff --git a/src/blueshift_iccprofile.c b/src/blueshift_iccprofile.c
index ef04701..68635d2 100644
--- a/src/blueshift_iccprofile.c
+++ b/src/blueshift_iccprofile.c
@@ -45,7 +45,6 @@ static xcb_generic_error_t* error;
*/
int main(int argc, char** argv)
{
- const xcb_setup_t* setup;
xcb_screen_iterator_t iter;
int screen_count;
xcb_screen_t* screens;
@@ -55,21 +54,41 @@ int main(int argc, char** argv)
(void) argv;
+ /* To get all ICC profiles, which are binary encoded, we have
+ to connect to the display and for each screen look for
+ properties maching the pattern "_ICC_PROFILE(|_[0-9]*)".
+ But we should also do it without being case sensitive,
+ because it is not well defined how the casing should be.
+ The _ICC_PROFILE atom is the profile for the first CRTC
+ (with the primary one being the first) within the screen.
+ _ICC_PROFILE_0 is not a valid atom for a profile,
+ _ICC_PROFILE_1 is for the secondard, and _ICC_PROFILE_2
+ is for the tertiary, and so on.
+ */
+
+
/* Get X connection */
+ /* This acquires a connection to the
+ X display indicated by the DISPLAY
+ environ variable. */
connection = xcb_connect(NULL, NULL);
/* Get screen information */
- setup = xcb_get_setup(connection);
- iter = xcb_setup_roots_iterator(setup);
+ /* Acquire a list of all screens in the displaym */
+ iter = xcb_setup_roots_iterator(xcb_get_setup(connection));
+ /* count the list, */
screen_count = iter.rem;
+ /* and start at the first screen. */
screens = iter.data;
for (screen_i = 0; screen_i < screen_count; screen_i++)
{
+ /* For each screen */
xcb_screen_t* screen = screens + screen_i;
+
xcb_list_properties_cookie_t list_cookie;
xcb_list_properties_reply_t* list_reply;
xcb_atom_t* atoms;
@@ -78,19 +97,27 @@ int main(int argc, char** argv)
/* Get root window properties */
+ /* Acquire a list of all properties on the current screen's root window.
+ global properties are set here, as well as monitor specific properties
+ that are actual monitor properties. */
list_cookie = xcb_list_properties(connection, screen->root);
list_reply = xcb_list_properties_reply(connection, list_cookie, &error);
if (error)
{
+ /* If we were not successful lets print an error
+ message and close the connection to the display. */
fprintf(stderr, "Screen root window property list query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
+ /* Extract the properties for the data structure that holds them, */
atoms = xcb_list_properties_atoms(list_reply);
+ /* and get the last one so that we can iterate over them nicely. */
atoms_end = atoms + xcb_list_properties_atoms_length(list_reply);
+ /* For each property */
for (; atoms != atoms_end; atoms++)
{
xcb_get_atom_name_cookie_t name_cookie;
@@ -105,62 +132,91 @@ int main(int argc, char** argv)
/* Get root window property name */
+ /* Acquire the the atom name. */
name_cookie = xcb_get_atom_name(connection, *atoms);
name_reply = xcb_get_atom_name_reply(connection, name_cookie, &error);
if (error)
{
+ /* If we were not successful lets print an error
+ message, free the property list and close the
+ connection to the display. */
fprintf(stderr, "Screen root window property name query returned %i\n", error->error_code);
free(list_reply);
xcb_disconnect(connection);
return 1;
}
+ /* Extract the atom name from the data structure that holds it. */
name_ = xcb_get_atom_name_name(name_reply);
+ /* As well as the length of the name; it is not NUL-termianted.*/
len = xcb_get_atom_name_name_length(name_reply);
- name = alloca((len + 1) * sizeof(char));
+ /* NUL-terminate the atom name, */
+ name = alloca((len + 1) * sizeof(char)); /* It is allocated on the stack, so it should not be free:d */
memcpy(name, name_, len * sizeof(char));
*(name + len) = 0;
+ /* and free the version that is not NUL-terminated. */
free(name_reply);
/* Check property name pattern */
+ /* Read the atom name */
if (!strcasecmp(name, "_icc_profile"))
+ /* _ICC_PROFILE is for monitor 0 */
monitor = 0;
else if (strcasestr(name, "_icc_profile_") == name)
{
+ /* Skip to the part that should be numerical */
name += strlen("_icc_profile_");
monitor = 0;
if (*name == '\0')
+ /* Invalid: no index */
continue;
+ /* Parse index */
while (*name)
{
char c = *name++;
+ /* with strict format matching. */
if (('0' <= c) && (c <= '9'))
monitor = monitor * 10 - (c & 15);
else
+ /* Not numerical: did not match */
goto monitor_bad;
}
+ /* Convert from negative to possitive. */
monitor = -monitor;
- goto monitor_ok;
+ /* Check that it is not zero, zero is
+ not a valid index, it should just be
+ _ICC_PROFILE in such case. */
+ if (monitor > 0)
+ goto monitor_ok;
monitor_bad:
+ /* Atom name ultimately did not match the, pattern
+ ignore it, it may be for something else, but it
+ is propably just invalid. */
continue;
}
else
+ /* Atom name does not match the pattern,
+ ignore it, it is for something else. */
continue;
/* Get root window property value */
monitor_ok:
+ /* Acquire the property's value */
prop_cookie = xcb_get_property(connection, 0, screen->root, *atoms, XCB_GET_PROPERTY_TYPE_ANY, 0, 0);
prop_reply = xcb_get_property_reply(connection, prop_cookie, &error);
if (error)
{
+ /* If we were not successful lets print an error
+ message, free the property and property list
+ and close the connection to the display. */
fprintf(stderr, "Screen root window property value query returned %i\n", error->error_code);
free(prop_reply);
free(list_reply);
@@ -168,14 +224,17 @@ int main(int argc, char** argv)
return 1;
}
+ /* Get the length of the property's value */
len = prop_reply->bytes_after;
- free(prop_reply);
prop_cookie = xcb_get_property(connection, 0, screen->root, *atoms, XCB_GET_PROPERTY_TYPE_ANY, 0, len);
prop_reply = xcb_get_property_reply(connection, prop_cookie, &error);
if (error)
{
+ /* If we were not successful lets print an error
+ message, free the property and property list
+ and close the connection to the display. */
fprintf(stderr, "Screen root window property value query returned %i\n", error->error_code);
free(prop_reply);
free(list_reply);
@@ -183,31 +242,43 @@ int main(int argc, char** argv)
return 1;
}
+ /* Encode the property's value hexadecimally */
{
+ /* Allocate memories on the stack to fill with property's
+ value in with hexadecimal encoding and NUL-termination. */
char* value = alloca((2 * len + 1) * sizeof(char));
+ /* Get the property's value. */
char* value_ = xcb_get_property_value(prop_reply);
int i;
+ /* Recode */
for (i = 0; i < len; i++)
{
*(value + i * 2 + 0) = "0123456789abcdef"[(*(value_ + i) >> 4) & 15];
*(value + i * 2 + 1) = "0123456789abcdef"[(*(value_ + i) >> 0) & 15];
}
+ /* NUL-terminate */
*(value + 2 * len) = 0;
+ /* Print screen, monitor and profile. */
printf("%i: %i: %s\n", screen_i, monitor, value);
}
+ /* Free the property resources. */
free(prop_reply);
}
+ /* Free the list is properties. */
free(list_reply);
}
+ /* Flush standard output to be sure that everything was printed,
+ should not be necessary, but it is best to be on the safe side. */
fflush(stdout);
- /* Free resources **/
+ /* Free resources */
+ /* Close connection to the display. */
xcb_disconnect(connection);
return 0;
}